Excuse the quality of this video, which my wife took while challenging me to a game of ping pong.
So what's the point?
It's important to work hard, but also to enjoy life and have some good times as well.
There is a Talmudic saying that he who goes through life without enjoying the world will be held accountable by G-d.
Aside from Judaism being against strict asceticism, this saying always sort of bewildered me, like why would religion need to tell you to enjoy yourself?
I think the answer is that in our zeal to advance ourselves--whatever that means for each person (accumulating wealth, offspring, expertise, fame, wisdom, spiritual growth)--we can go overboard, become obsessive-compulsive, and forget to refresh, rejuvenate and just relax and enjoy the life too.
You don't have to deny yourself; but also, you don't have to go crazy and be a pig either--just be balanced.
Play some ping pong or whatever, let loose a little, and be yourself. :-)